Method of manufacturing seamless plate-metal vessels of angular cross-section.



PATENTED SEPT. 4, 1906 0. ANDBRSSON. METHOD OF MANUFACTURING sB MLEss PLATE METAL vBss Ls OP ANGULAR GROSS SECTION.

Smuenl'oz APPLICATION FILED 0GT.18. 1905.

. 5- through a matrix or several matrices by the a TE t me or ro ANDERSSON, or

oLorsrRoM, SWEDEN;

METHOD OF MANUFACTURING SEAMLESS PLATE-METAL VEss ELs F ANGULAR cRess-sEcTwN.

Specification of Application filed October 18,

To all whom it may concern: Be it known that I, Qr'ro ANnERssoN, engineer, a subject of the King of Sweden, residing at Olofstrom, county of Blekinge, Sweden, have invented new and useful Improvements in Methods of Manufacturing Seamless Plate- Metal. Vessels of Angular Cross-Section, of which the following is a specification. In manufacturing seamless vessels of angular cross-section the method has hitherto been employed of first drawing a IOUIIdYVGS- sel blank provided with abottom shoulder of a shape corresponding to the desired angular shape of the completed vessel and subsequently drawing this blank, bottom first,

aid of an angular mandrel or die of the cross.

. section required in the completed'vessel; In' the said operation the surplus materialarising in the transitiom for instance, from. a round to a square sha e must beeither upset or transferred forwar and inasmuch as such superfluous material always occurs to a greater extent at the sides than at the corhers and thin metal plate has more of a tendency to fold than be upset the result is the occurrence of a numberof unsightly creases along the sides and of irregular stresses in'the material which frequently cause a tearing of same, and therefore the production of dee angular sharp-cornered vessels of thin plate metal in the manner just described is almost impossible. On the other hand, according to the present invention angular. seamless vessels of any depth and with sharp corners can be manufactured from thin plate metal I by pushing (pressing) a blank of round ,(cir

cular or oval) cross-section made in usual manner of the same perimeter as the completed angular vessel, the mouth or orifice, first through the an ular-inatrix or matrices. The advantage is ti from a roundto a square shape will without irregular strfesse'sor upsettings adjust itself in i tom I claim is at the surplus material above mentioned as the bottompasses over Letters'P atent. Patentedsept. 4, 19cc.

1905. swarm. 233.352.

formed, which folds may ,be subsequently deflected either toward the bottom ortoward the sides or may be bent inward.

In the accompanying drawingsacouple of blanks are illustrated in'Fi' ure-l, while Figs. 2 and 3; illustrate such'a bank at the begin- *ning and end of a drawing operation. Fig. 4 illustrates a completed vessel with the'folds deflected toward the bottom-,while Fig. 5 illustratesa section ofjsuch a vesselwiththe folds deflected inward. Fig. 6 shows the completed vessel, Fig. 4, insection. a isthe blank,b the matrix, and c the mandrel for preyenting the sides from yielding inward, said mandrel being inserted into the blank and having its corners faced off. (1 is the pushing mandrel proper by means of whichthe blank is forced-throu h the matrix, and 0 represents the creases or olds.

Having thus described my invention, what 1. An improved method of manufacturing seamless vessels of angular crosssection from pressed blanks of a curved section, consisting in pushing the blanks, mouth first, through matrices of the desired angular cross-section, and deflecting the folds or flaps formed at the'bottom against the vessel.

2. An improved method of manufacturing seamless vessels of angular cross-section from pressed blanks, of a curved-section, consisting in placin the bottom of the vessel be' tween two mandrels c and d,'then placing the open end of said vessel into a converging matrix, passing the vessel jointly with the 'mandrels through said matrix and finally bending the folds at the bottom against the vessel, substantially as described.

' In testimony whereof I havefsignedjmy name to this specification in the presence of "twoisubscribing witnesses.

orTo ANDERSSON. I

Witnesses;

' A. G. FAYERsTnoM,

a regular fold on each side of the angular bot- A.- MONA'N. 

